{"segment":[{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-5"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","type_check":"","ques":"Cho h\u00e0m s\u1ed1 $y=f(x)=3x+2$. Bi\u1ebft $f(x)= -13$. T\u00ednh $x$.<br\/>Gi\u00e1 tr\u1ecb $x$ t\u00ecm \u0111\u01b0\u1ee3c l\u00e0 _input_","hint":"Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh $f(x) = -13$ ","explain":"<span class='basic_left'>Ta c\u00f3: <br\/> $f(x)=-13$ <br\/> $\\Leftrightarrow 3x + 2=-13$ <br\/> $\\Leftrightarrow 3x= -15$ <br\/> $\\Leftrightarrow x= -5$<br\/><span class='basic_pink'> Do \u0111\u00f3 s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $-5$.<\/span>"}]}],"id_ques":1},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-6"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","type_check":"","ques":"Cho h\u00e0m s\u1ed1 $y=f(x)=\\dfrac{x}{2}+1$. Bi\u1ebft $f(x)= -2$. T\u00ednh $x$.<br\/>Gi\u00e1 tr\u1ecb $x$ t\u00ecm \u0111\u01b0\u1ee3c l\u00e0 _input_","hint":"Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh $f(x) = -2$","explain":"<span class='basic_left'>Ta c\u00f3: <br\/> $f(x)=-2$ <br\/>$\\Leftrightarrow \\dfrac{x}{2}+1=-2$ <br\/> $\\Leftrightarrow \\dfrac{x}{2}= -3$ <br\/> $ \\Leftrightarrow x= -6$<br\/><span class='basic_pink'> Do \u0111\u00f3 s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $-6$.<\/span>"}]}],"id_ques":2},{"time":24,"part":[{"time":24,"title":"N\u1ed1i m\u1ed7i d\u00f2ng \u1edf c\u1ed9t tr\u00e1i v\u1edbi m\u1ed7i d\u00f2ng \u1edf c\u1ed9t ph\u1ea3i \u0111\u1ec3 \u0111\u01b0\u1ee3c kh\u1eb3ng \u0111\u1ecbnh \u0111\u00fang","title_trans":"","audio":"","temp":"matching","correct":[["2","3","1"]],"list":[{"point":5,"image":"","left":["H\u00e0m s\u1ed1 $y=\\dfrac{3}{x+1}$ x\u00e1c \u0111\u1ecbnh v\u1edbi","H\u00e0m s\u1ed1 $y= x +3$ x\u00e1c \u0111\u1ecbnh v\u1edbi","H\u00e0m s\u1ed1 $y= \\sqrt{x+2}$ x\u00e1c \u0111\u1ecbnh v\u1edbi"],"right":["m\u1ecdi $x \\ge -2$","m\u1ecdi $x \\ne -1$","m\u1ecdi $x \\in \\mathbb{R}$"],"top":100,"hint":"T\u00ecm \u0111i\u1ec1u ki\u1ec7n \u0111\u1ec3 h\u00e0m s\u1ed1 c\u00f3 ngh\u0129a. <br\/>$\\dfrac{a}{b}$ c\u00f3 ngh\u0129a $\\Leftrightarrow b \\ne 0$.<br\/>$\\sqrt{a}$ c\u00f3 ngh\u0129a $\\Leftrightarrow a \\ge 0$","explain":"<span class='basic_left'> H\u00e0m s\u1ed1 $y=\\dfrac{3}{x+1}$ x\u00e1c \u0111\u1ecbnh v\u1edbi m\u1ecdi $x \\ne -1$ <br\/>H\u00e0m s\u1ed1 $y= x +3$ x\u00e1c \u0111\u1ecbnh v\u1edbi m\u1ecdi $x \\in \\mathbb{R}$ <br\/>H\u00e0m s\u1ed1 $y= \\sqrt{x+2}$ x\u00e1c \u0111\u1ecbnh v\u1edbi m\u1ecdi $x \\ge -2$."}]}],"id_ques":3},{"time":24,"part":[{"title":"H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"M\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh l\u00e0 $20\\, cm$. Ng\u01b0\u1eddi ta t\u0103ng m\u1ed7i k\u00edch th\u01b0\u1edbc c\u1ee7a h\u00ecnh \u0111\u00f3 \u0111i $x\\, (cm)$. G\u1ecdi chu vi h\u00ecnh vu\u00f4ng m\u1edbi l\u00e0 $y\\, (cm)$. C\u00f4ng th\u1ee9c t\u00ednh chu vi $y$ c\u1ee7a h\u00ecnh vu\u00f4ng m\u1edbi theo $x$ l\u00e0:","select":["A. $y=80 +4x$","B. $y=4x-20$","C. $y=4x-80$ ","D. $y=4x+20$"],"hint":"Chu vi h\u00ecnh vu\u00f4ng b\u1eb1ng b\u1ed1n l\u1ea7n c\u1ea1nh h\u00ecnh vu\u00f4ng. ","explain":"<span class='basic_left'>C\u1ea1nh h\u00ecnh vu\u00f4ng m\u1edbi c\u00f3 k\u00edch th\u01b0\u1edbc l\u00e0: $20 +x\\, (cm)$<br\/>C\u00f4ng th\u1ee9c t\u00ednh chu vi $y$ c\u1ee7a h\u00ecnh vu\u00f4ng m\u1edbi l\u00e0: <br\/>$y=4.(20+x)=80+4x$<br\/><span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 $A$.<\/span>","column":2}]}],"id_ques":4},{"time":24,"part":[{"title":"H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 c\u00e1c k\u00edch th\u01b0\u1edbc l\u00e0 $10\\, cm$ v\u00e0 $15\\, cm$. Ng\u01b0\u1eddi ta b\u1edbt m\u1ed7i k\u00edch th\u01b0\u1edbc c\u1ee7a h\u00ecnh \u0111\u00f3 \u0111i $x\\, (cm)$. G\u1ecdi chu vi h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 $y\\, (cm)$. C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh ch\u1eef nh\u1eadt m\u1edbi theo $x$ l\u00e0: ","select":["A. $y=2x-50$","B. $y=50-4x$","C. $y=4x-50$ ","D. $y=50-2x$"],"hint":"Chu vi h\u00ecnh ch\u1eef nh\u1eadt b\u1eb1ng hai l\u1ea7n t\u1ed5ng \u0111\u1ed9 d\u00e0i hai \u0111\u00e1y. ","explain":"<span class='basic_left'>C\u00e1c k\u00edch th\u01b0\u1edbc c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt m\u1edbi l\u00e0 $10-x\\,(cm)$ v\u00e0 $15-x$ $(cm)$<br\/>C\u00f4ng th\u1ee9c t\u00ednh chu vi $y$ c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt m\u1edbi l\u00e0: <br\/>$y=2.(10-x+15-x)$$=2(25-2x)=50-4x$<br\/><span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span>","column":2}]}],"id_ques":5},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["4"],["0"],["2"],["-2"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","type_check":"","ques":"Cho h\u00ecnh v\u1ebd, x\u00e1c \u0111\u1ecbnh to\u1ea1 \u0111\u1ed9 c\u00e1c \u0111i\u1ec3m $C$ v\u00e0 $G$.<br\/><center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai9/lv1/img\/D9211_1.png' \/><\/center>\u0110\u00e1p s\u1ed1: $C$(_input_;_input_); $G$(_input_;_input_)","hint":"Nh\u00ecn v\u00e0o h\u00ecnh v\u1ebd ch\u1ec9 ra t\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m. ","explain":"<span class='basic_left'> \u0110i\u1ec3m $C$ c\u00f3 t\u1ecda \u0111\u1ed9 l\u00e0 $(4;0)$.<br\/>\u0110i\u1ec3m $G$ c\u00f3 t\u1ecda \u0111\u1ed9 l\u00e0 $(2;-2)$.<br\/><span class='basic_pink'> Do \u0111\u00f3 s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $(4;0)$ v\u00e0 $(2;-2)$.<\/span>"}]}],"id_ques":6},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["2"],["2"],["0"],["-3"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","type_check":"","ques":"Cho h\u00ecnh v\u1ebd, x\u00e1c \u0111\u1ecbnh to\u1ea1 \u0111\u1ed9 c\u00e1c \u0111i\u1ec3m $F$ v\u00e0 $D$.<br\/><center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai9/lv1/img\/D9211_1.png' \/><\/center><br\/>\u0110\u00e1p s\u1ed1: $F$(_input_;_input_); $D$(_input_;_input_)","hint":"Nh\u00ecn v\u00e0o h\u00ecnh v\u1ebd ch\u1ec9 ra t\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m ","explain":"<span class='basic_left'> \u0110i\u1ec3m $F$ c\u00f3 t\u1ecda \u0111\u1ed9 l\u00e0 $(2;2)$.<br\/>\u0110i\u1ec3m $D$ c\u00f3 t\u1ecda \u0111\u1ed9 l\u00e0 $(0;-3)$.<br\/><span class='basic_pink'> Do \u0111\u00f3 s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $(2;2)$ v\u00e0 $(0;-3)$.<\/span>"}]}],"id_ques":7},{"time":24,"part":[{"title":"H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai9/lv1/img\/2.jpg' \/><\/center>Trong c\u00e1c h\u00e0m s\u1ed1 sau, h\u00e0m s\u1ed1 n\u00e0o l\u00e0 \u0111\u1ed3ng bi\u1ebfn? ","select":["A. $y=\\dfrac{-2}{3}x+\\dfrac{1}{2}$","B. $y=\\dfrac{x}{3}-5$","C. $y=-2x+5$ ","D. $y=7-3x$"],"hint":"H\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t $y= ax +b$ ($a\\ne 0$) \u0111\u1ed3ng bi\u1ebfn n\u1ebfu $a > 0$. ","explain":"<span class='basic_left'> + H\u00e0m s\u1ed1 $y=\\dfrac{-2}{3}x+\\dfrac{1}{2}$ c\u00f3 h\u1ec7 s\u1ed1 $a=\\dfrac{-2}{3} <0$ <br\/> $\\Rightarrow$ H\u00e0m s\u1ed1 $y=\\dfrac{-2}{3}x+\\dfrac{1}{2}$ ngh\u1ecbch bi\u1ebfn. <br\/> + H\u00e0m s\u1ed1 $y= \\dfrac{x}{3}-5$ c\u00f3 h\u1ec7 s\u1ed1 $a=\\dfrac{1}{3} > 0$ <br\/> $\\Rightarrow$ H\u00e0m s\u1ed1 $y=\\dfrac{x}{3}-5$ \u0111\u1ed3ng bi\u1ebfn. <br\/> + H\u00e0m s\u1ed1 $y=-2x+5$ c\u00f3 h\u1ec7 s\u1ed1 $a=-2 < 0$ <br\/> $\\Rightarrow $ H\u00e0m s\u1ed1 $y=-2x+5$ ngh\u1ecbch bi\u1ebfn. <br\/> + H\u00e0m s\u1ed1 $y=7-3x$ c\u00f3 h\u1ec7 s\u1ed1 $a=-3 < 0$ <br\/> $\\Rightarrow$ H\u00e0m s\u1ed1 $y=7-3x$ ngh\u1ecbch bi\u1ebfn. <br\/><span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span>","column":2}]}],"id_ques":8},{"time":24,"part":[{"title":"H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Trong c\u00e1c h\u00e0m s\u1ed1 sau, h\u00e0m s\u1ed1 n\u00e0o l\u00e0 ngh\u1ecbch bi\u1ebfn?","select":["A. $y=\\dfrac{1}{5}x-2$","B. $y=\\dfrac{2x}{3}+1$","C. $y=x+5$ ","D. $y=3-2x$"],"hint":"H\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t $y= ax +b$ ($a\\ne 0$) ngh\u1ecbch bi\u1ebfn n\u1ebfu $a < 0$. ","explain":"<span class='basic_left'>+ H\u00e0m s\u1ed1 $y=\\dfrac{1}{5}x-2$ c\u00f3 h\u1ec7 s\u1ed1 $a=\\dfrac{1}{5} > 0 $ <br\/> $\\Rightarrow$ H\u00e0m s\u1ed1 $y=\\dfrac{1}{5}x-2$ \u0111\u1ed3ng bi\u1ebfn. <br\/> + H\u00e0m s\u1ed1 $y=\\dfrac{2x}{3}+1$ c\u00f3 h\u1ec7 s\u1ed1 $a=\\dfrac{2}{3} > 0$ <br\/> $\\Rightarrow$ H\u00e0m s\u1ed1 $y=\\dfrac{2x}{3}+1$ \u0111\u1ed3ng bi\u1ebfn. <br\/> + H\u00e0m s\u1ed1 $y=x+5$ c\u00f3 h\u1ec7 s\u1ed1 $a=1 > 0$ <br\/> $\\Rightarrow$ H\u00e0m s\u1ed1 $y=x+5$ \u0111\u1ed3ng bi\u1ebfn. <br\/>+ H\u00e0m s\u1ed1 $y= 3- 2x$ c\u00f3 h\u1ec7 s\u1ed1 $a=-2 < 0 $ <br\/> $\\Rightarrow$ H\u00e0m s\u1ed1 $y= 3-2x$ ngh\u1ecbch bi\u1ebfn.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span>","column":2}]}],"id_ques":9},{"time":24,"part":[{"title":"H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Trong c\u00e1c h\u00e0m s\u1ed1 sau, h\u00e0m s\u1ed1 n\u00e0o l\u00e0 h\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t?","select":["A. $y=5x^2+3$","B. $y=x-11$","C. $y=\\dfrac{2}{x}$ ","D. $y=\\dfrac{x^2}{2}+3$"],"hint":"H\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t c\u00f3 d\u1ea1ng $y= ax +b$ ($a\\ne 0$) ","explain":"<span class='basic_left'>H\u00e0m s\u1ed1 $y=x-11$ l\u00e0 h\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t. <br\/><span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span>","column":2}]}],"id_ques":10},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-2"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","type_check":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai9/lv1/img\/1.png' \/><\/center>Cho h\u00e0m s\u1ed1 $y=f(x)=\\dfrac{2}{3}x$.T\u00ednh $f(-3)$. <br\/> <br\/> <b> \u0110\u00e1p \u00e1n:<\/b> $f(-3)=$_input_ ","hint":"Thay $x= -3$ v\u00e0o h\u00e0m s\u1ed1 $y=f(x)=\\dfrac{2}{3}x$","explain":"<span class='basic_left'> Thay $x= -3$ v\u00e0o h\u00e0m s\u1ed1 $y=f(x)=\\dfrac{2}{3}x$, ta \u0111\u01b0\u1ee3c:<br\/> $y=f(-3)=\\dfrac{2}{3}.(-3)=-2$. <br\/><span class='basic_pink'> Do \u0111\u00f3 s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $-2$. <\/span>"}]}],"id_ques":11},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["5"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","type_check":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai9/lv1/img\/9.jpg' \/><\/center>H\u00e0m s\u1ed1 $y=(a-5)x+1$ l\u00e0 h\u00e0m h\u1eb1ng khi $a=$_input_ ","hint":"H\u00e0m s\u1ed1 $y = ax+ b$ l\u00e0 h\u00e0m h\u1eb1ng khi $a= 0$. ","explain":"<span class='basic_left'> H\u00e0m s\u1ed1 $y=(a-5)x+1$ l\u00e0 h\u00e0m h\u1eb1ng khi $a-5=0 \\Leftrightarrow a= 5$ <br\/><span class='basic_pink'> Do \u0111\u00f3 s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $5$. <\/span>"}]}],"id_ques":12},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-2"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","type_check":"","ques":"<span class='basic_left'> Cho h\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t $y= 2ax-1$.<br\/> T\u00ecm h\u1ec7 s\u1ed1 $a$, bi\u1ebft r\u1eb1ng khi $x=2$ th\u00ec $y =-9$.<br\/>Gi\u00e1 tr\u1ecb $a$ t\u00ecm \u0111\u01b0\u1ee3c l\u00e0 _input_ <\/span>","hint":"Thay $x= 2$ v\u00e0 $y= -9$ v\u00e0o h\u00e0m s\u1ed1 $y= 2ax - 1$ \u0111\u1ec3 t\u00ednh $a$. ","explain":"<span class='basic_left'> Thay $x= 2$ v\u00e0 $y =-9$ v\u00e0o h\u00e0m s\u1ed1 $y= 2ax-1$, ta \u0111\u01b0\u1ee3c: <br\/> $-9=2a.2-1$ <br\/> $\\Leftrightarrow a= -2$<br\/><span class='basic_pink'> Do \u0111\u00f3 s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $-2$. <\/span>"}]}],"id_ques":13},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-30"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","type_check":"","ques":"<span class='basic_left'>Cho h\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t $y= ax+ 5$.<br\/> T\u00ecm h\u1ec7 s\u1ed1 $a$, bi\u1ebft r\u1eb1ng khi $x=1$ th\u00ec $y =-25$.<br\/>Gi\u00e1 tr\u1ecb $a$ t\u00ecm \u0111\u01b0\u1ee3c l\u00e0 _input_ <\/span> ","hint":"Thay $x= 1$ v\u00e0 $y= -25$ v\u00e0o h\u00e0m s\u1ed1 $y= ax + 5$ \u0111\u1ec3 t\u00ednh $a$. ","explain":"<span class='basic_left'> Thay $x= 1$ v\u00e0 $y =-25$ v\u00e0o h\u00e0m s\u1ed1 $y= ax+5$, ta \u0111\u01b0\u1ee3c: <br\/> $-25=a.1+5$ <br\/> $\\Leftrightarrow a= -30$ <br\/><span class='basic_pink'> Do \u0111\u00f3 s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $-30$. <\/span>"}]}],"id_ques":14},{"time":24,"part":[{"title":"H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai9/lv1/img\/9.jpg' \/><\/center>T\u00ecm $a$ \u0111\u1ec3 h\u00e0m s\u1ed1 $y= (3-a)x+4$ \u0111\u1ed3ng bi\u1ebfn tr\u00ean $\\mathbb{R}$","select":["A. $a<3$","B. $a<4$","C. $a>3$ ","D. $a=3$"],"hint":"H\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t $y= ax +b\\, (a\\ne 0)$ \u0111\u1ed3ng bi\u1ebfn n\u1ebfu $a > 0$","explain":"<span class='basic_left'>H\u00e0m s\u1ed1 $y= (3-a)x + 4$ \u0111\u1ed3ng bi\u1ebfn $\\Leftrightarrow 3-a > 0 \\Leftrightarrow a < 3$ <br\/><span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span>","column":4}]}],"id_ques":15},{"time":24,"part":[{"title":"H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/toan/daiso/bai9/lv1/img\/4.jpg' \/><\/center>T\u00ecm $a$ \u0111\u1ec3 h\u00e0m s\u1ed1 $y= (a-2)x-5$ ngh\u1ecbch bi\u1ebfn tr\u00ean $\\mathbb{R}$.","select":["A. $a=2$","B. $a<-5$","C. $a>2$ ","D. $a< 2$"],"hint":"H\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t $y= ax +b\\, (a\\ne 0)$ ngh\u1ecbch bi\u1ebfn n\u1ebfu $a < 0$.","explain":"<span class='basic_left'> H\u00e0m s\u1ed1 $y= (a-2)x -5$ ngh\u1ecbch bi\u1ebfn $\\Leftrightarrow a - 2 < 0 \\Leftrightarrow a < 2$ <br\/><span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span>","column":2}]}],"id_ques":16},{"time":24,"part":[{"title":"H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"H\u00e0m s\u1ed1 $y= (m+1)x+2$ l\u00e0 h\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t khi:","select":["A. $m \\ne 1$","B. $m \\ne - 1$","C. $m=-1$ ","D. $m > -1$"],"hint":"H\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t c\u00f3 d\u1ea1ng $y= ax +b\\, (a\\ne 0)$. ","explain":"<span class='basic_left'>H\u00e0m s\u1ed1 $y= (m+1)x +2$ l\u00e0 h\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t khi $m +1 \\ne 0 \\Leftrightarrow m \\ne -1$ <br\/><span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B. <\/span>","column":2}]}],"id_ques":17},{"time":24,"part":[{"title":"H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"H\u00e0m s\u1ed1 $y= (m- 5)x-3$ l\u00e0 h\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t khi:","select":["A. $m \\ne 5$","B. $m \\ne - 5$","C. $m=5$ ","D. $m > 5$"],"hint":"H\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t c\u00f3 d\u1ea1ng $y= ax +b$ ($a\\ne 0$) ","explain":"<span class='basic_left'> H\u00e0m s\u1ed1 $y= (m-5)x - 3$ l\u00e0 h\u00e0m s\u1ed1 b\u1eadc nh\u1ea5t khi $m - 5 \\ne 0 \\Leftrightarrow m \\ne 5$. <br\/><span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A. <\/span>","column":4}]}],"id_ques":18},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-5"],["-3"],["-1"],["0"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","type_check":"","ques":"T\u00ecm gi\u00e1 tr\u1ecb $y$ t\u01b0\u01a1ng \u1ee9ng c\u1ee7a h\u00e0m s\u1ed1 $\\,y= x - 2\\,$ theo gi\u00e1 tr\u1ecb \u0111\u00e3 cho c\u1ee7a bi\u1ebfn $x$ r\u1ed3i \u0111i\u1ec1n v\u00e0o b\u1ea3ng sau:<br\/><table> <tr> <th>$x$<\/th> <th>$-3$<\/th> <th>$-1$<\/th> <th>$1$<\/th> <th>$2$<\/th> <\/tr> <tr> <td>$y=x - 2$<\/td> <td>_input_<\/td> <td>_input_<\/td> <td>_input_<\/td> <td>_input_<\/td> <\/tr><\/table> ","hint":"Thay l\u1ea7n l\u01b0\u1ee3t c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a $x$ v\u00e0o h\u00e0m s\u1ed1 $y= x - 2$. ","explain":"<span class='basic_left'> V\u1edbi $x=-3$, suy ra $y=-3-2=-5$.<br\/> V\u1edbi $x=-1$, suy ra $y=-1-2=-3$ <br\/> V\u1edbi $x=1$, suy ra $y=1-2=-1$<br\/> V\u1edbi $x=2$, suy ra $y=2-2=0$<br\/>Ta c\u00f3 b\u1ea3ng sau: <br\/> <table> <tr> <th>$x$<\/th> <th>$-3$<\/th> <th>$-1$<\/th> <th>$1$<\/th> <th>$2$<\/th> <\/tr> <tr> <td>$y=x-2$<\/td> <td>$-5$<\/td> <td>$-3$<\/td> <td>$-1$<\/td> <td>$0$<\/td> <\/tr><\/table> <br\/><span class='basic_pink'> C\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0 $-5; -3; -1;0$. <\/span>"}]}],"id_ques":19},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-1"],["3"],["5"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","type_check":"","ques":"T\u00ecm gi\u00e1 tr\u1ecb $y$ t\u01b0\u01a1ng \u1ee9ng c\u1ee7a h\u00e0m s\u1ed1 $y= 2x + 3$ theo gi\u00e1 tr\u1ecb \u0111\u00e3 cho c\u1ee7a bi\u1ebfn $x$ r\u1ed3i \u0111i\u1ec1n v\u00e0o b\u1ea3ng sau:<br\/><table> <tr> <th>$x$<\/th> <th>$-2$<\/th> <th>$-1$<\/th> <th>$0$<\/th> <th>$1$<\/th> <\/tr> <tr> <td>$y=2x+3$<\/td> <td>_input_<\/td> <td>$1$<\/td> <td>_input_<\/td> <td>_input_<\/td> <\/tr><\/table> ","hint":"Thay c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a $x$ l\u1ea7n l\u01b0\u1ee3t v\u00e0o h\u00e0m s\u1ed1 $y= 2x + 3$. ","explain":"<span class='basic_left'>V\u1edbi $x=-2$, suy ra $y=2.(-2)+3=-1$<br\/>V\u1edbi $x=0$, suy ra $y=2.0+3=3$<br\/>V\u1edbi $x=1$, suy ra $y=2.1+3=5$<br\/>Ta c\u00f3 b\u1ea3ng sau: <br\/> <table> <tr> <th>$x$<\/th> <th>$-2$<\/th> <th>$-1$<\/th> <th>$0$<\/th> <th>$1$<\/th> <\/tr> <tr> <td>$y=2x+3$<\/td> <td>$-1$<\/td> <td>$1$<\/td> <td>$3$<\/td> <td>$5$<\/td> <\/tr><\/table> <br\/><span class='basic_pink'> C\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0 $-1; 3; 5$. <\/span>"}]}],"id_ques":20}],"lesson":{"save":0,"level":1}}